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首页> 外文会议>Terahertz technology and applications III >Design and performance of reflective ultra broadband terahertz time-domain spectroscopy with air-biased-coherent-detection
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Design and performance of reflective ultra broadband terahertz time-domain spectroscopy with air-biased-coherent-detection

机译：空气偏置相干检测的反射超宽带太赫兹时域光谱仪的设计与性能

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摘要

In general, a reflective spectrometer is more suitable for the spectroscopic measurement for highly absorptive samples. We report the design and evaluation of a reflective terahertz time-domain spectroscopy (R-THz-TDS), using air as THz wave emitter and sensor, together with air-biased-coherent-detection (ABCD) method. With an 85 fs pulse amplified laser, we demonstrate a usable bandwidth from 0.5 THz to 12 THz, together with a peak dynamic range (DR) better than 2000:1 and a peak THz electrical field greater than 30 kV/cm. With a 32 fs pulse amplified laser, the usable bandwidth is further expanded to a continuous 35 THz. Several far-infrared optical properties such as phonon resonance and plasma resonance in various samples are reported. We also compared both transmission and reflection measurements. Furthermore, the time-resolved optical pump-THz probe experiment is performed. The evolution of carrier dynamics of GaAs and InSb samples are demonstrated in this study. Finally, the uniqueness and advantage of this R-THz-TDS spectrometer are comprehensively compared with traditional THz-TDS and Fourier transform infrared (FTIR) spectroscopy, including radiation source, detector, DR, bandwidth, resolution, peak power, and other features. In terms of signal-to-noise ratio (SNR), this study provides the SNR variation with frequency in both broadband R-THz-TDS and FTIR spectroscopy.
机译：通常，反射光谱仪更适合于高吸收样品的光谱测量。我们报告设计和评估的反射太赫兹时域光谱（R-THz-TDS），使用空气作为太赫兹波发射器和传感器，以及空气偏置相干检测（ABCD）方法。使用85 fs脉冲放大激光器，我们展示了从0.5 THz到12 THz的可用带宽，以及超过2000：1的峰值动态范围（DR）和大于30 kV / cm的峰值THz电场。使用32 fs脉冲放大激光器，可用带宽进一步扩展到连续的35 THz。报告了各种样品中的几种远红外光学性质，例如声子共振和等离子体共振。我们还比较了透射和反射测量。此外，进行了时间分辨光泵-THz探针实验。这项研究证明了GaAs和InSb样品的载流子动力学的演变。最后，将这种R-THz-TDS光谱仪的独特性和优势与传统的THz-TDS和傅立叶变换红外（FTIR）光谱进行了全面比较，包括辐射源，探测器，DR，带宽，分辨率，峰值功率和其他功能。在信噪比（SNR）方面，本研究提供了宽带R-THz-TDS和FTIR光谱中SNR随频率的变化。

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